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Missing or invalid claim information · Last verified 2026-08-30

CARC 16 denial code on dental claims

Independent publisher · Drafted with AI assistance, verified against primary sources · Credentialed review pending

CARC 16 is the “Missing or invalid information” code on a dental remittance. Correct it and resubmit inside the filing window; this is not an appeal.

Group code: X12 places no group-code restriction on 16. The payer chooses the group code under its own contract. A group code always travels with a CARC, and it — not the CARC — assigns financial responsibility, so read the one on your remittance rather than assuming. Offices commonly write this one as CO 16; that is search shorthand, not a statement that the payer will use CO.

Registry entry: X12 Claim Adjustment Reason Code 16 — active, with no deactivation date. Read on the list published 2025-11-01.

Remark code required:this code's own definition requires one, so a remittance carrying it without a remark code is incomplete.

Verdict

Technical — fix and resubmit

The route here is correcting the identified defect and resubmitting as a corrected claim, inside the timely-filing window, rather than arguing the decision.

This is usually not an appeal situation — correct the identified element and resubmit. Track the payer's timely-filing window while you fix it: a corrected claim must still land inside it.

The verdict cannot be settled from the CARC alone — the remark code that arrived with it carries the specific reason.

The appealability verdicts on these pages are Dentovio's editorial classification. No standards body or payer publishes an appealability taxonomy: X12 defines what a code means, not what to do about it. Each verdict is built from the code's own mechanics and the payer and federal documents cited on the page, and it is a starting point for triage rather than a prediction of any outcome.

What it means in dental

Processing stopped because a required claim detail is absent or a billing or submission field is defective. The accompanying remark code identifies the problem; a different CARC applies when an attachment itself is missing.

A fixable submission defect may be a missing tooth number, quadrant indicator, subscriber ID mismatch, or an omitted field on the ADA claim form. The paired remark code on the ERA identifies which element failed, and payers use element-specific remarks rather than one generic one — MassHealth's published crosswalk maps CARC 16 to dozens of different M-, MA-, and N-series remarks depending on which field was wrong.

What to do

  1. 1.Read the remark code paired with the CARC on the ERA — it names the missing element
  2. 2.Correct the claim and resubmit as a corrected claim (do not submit a duplicate)
  3. 3.Confirm the resubmission lands inside the payer's timely-filing window

Remark codes verified with this CARC

X12 defines no CARC-to-RARC pairings. Each combination below is either a payer's own published crosswalk — true for that payer's internal reason code, not as a general rule — a CAQH CORE-required combination, or a remark whose registry meaning describes this adjustment.

N286 · Seen in a payer's own published crosswalk

The claim does not carry a usable identifier for the referring provider.

What to do: Add the referring provider's NPI to the claim and resubmit as corrected.

Molina Healthcare of Ohio has sent this exact CARC-and-remark combination since December 2021 and began denying claims received after 2025-10-01 that lack an ordering, referring, or prescribing provider. The bulletin addresses all network providers and never names a dental provider type, so read it as a Medicaid-MCO pattern dental claims sit inside rather than a dental-specific rule. MassHealth's crosswalk maps the same combination to its own referral-provider EOB.

M53 · Seen in a payer's own published crosswalk

The number of days or units billed on the line is absent or unusable.

What to do: Correct the units on the service line — quadrant counts and per-visit units are the usual dental culprits.

MassHealth's crosswalk pairs M53 with CARC 16 seventeen times, keyed to its own days-and-units EOB codes. Pairings in that document are per-EOB, not general rules.

M64 · Seen in a payer's own published crosswalk

A secondary diagnosis field is absent or unusable.

What to do: Supply the diagnosis the payer's edit expects — relevant where dental is billed on an institutional claim or crossed to medical, not on a routine dental claim.

MassHealth crosswalk, on its EOB for a procedure code that requires a diagnosis code. Per-EOB pairing.

N4 · Seen in a payer's own published crosswalk

The earlier payer's explanation of benefits is absent or unusable.

What to do: Get the earlier payer's complete EOB and resubmit with it attached. The registry says prior carrier, which is broader than primary — it reaches any earlier payer in the coordination chain.

All five N4 rows in MassHealth's crosswalk sit under CARC 16, not under the coordination-of-benefits code 22. The remark's own text carries no instruction; attaching the EOB is the operational consequence, not something the code says.

Read with this code

Sources

Last verified 2026-08-30. Dentovio is an independent publisher — not a payer, the ADA, X12, CAQH CORE, or any government agency. Code meanings and remark-code meanings on this page are Dentovio's own wording, written from the official X12 Claim Adjustment Reason Code and Remittance Advice Remark Code lists and linked back to them; X12 holds the copyright in those lists and its descriptions are not reproduced here. CDT codes are referenced by number only; CDT is the American Dental Association's copyrighted code set and this page does not reproduce ADA descriptors. Appealability verdicts are Dentovio editorial classification, not a standard. Every fact traces to the code steward's registry, a federal rule or manual, a HIPAA operating rule, an association publication, or a named payer's own document — never to a billing blog. This page was drafted with AI assistance and verified against the primary sources linked here. It has not been reviewed by a credentialed dental billing specialist, attorney, or clinician. Educational billing reference only — not billing, legal, or clinical advice. Plan contracts control individual outcomes, and processing policies usually live in the payer's provider manual rather than in the signed agreement. How this data is verified